Biography:

Abdullah Ibn-Hussein was born in Mecca, in 1882. He studied in Constantinople. During the First World War, he participated in the Arab Revolt against the Ottoman Empire. He would later become the Emir of Trans-Jordan, which was still under British rule at the time. Following the Second World War, and Jordan's independence he became the King of Jordan in 1946.

Following the creation of State of Israel out of the former British Palestine, Jordan and the other newly independent Arab Countries became unsatisfied with the result of the partition, and eventually became involved in open conflict with Israel, which led to the Arab-Israeli War in 1948. Abdullah played a leading role in this war, through his ambitions for the control of the West Bank. He was eventually assassinated in 1951, in part because he had put Jordan's interests ahead of the rest of the Arab League's, and he was willing to pursue peace with Israel without consulting his allies.

Sources:

Tucker, S (1996). The European Powers in the First World War. New York: Garland Publishing Inc. p.2.
http://en.wikipedia.org/wiki/King_Abdullah_I